I went back to read Goldman report from Dec2010. Their estimate of contract change due to other generic entry was well below what MNTA is going to get:
Duopoly is important, as economics change significantly with more competitors Under Momenta’s contract with Novartis, there are three competitive scenarios that carry different economics for Momenta. Continuation of the current market dynamics, in which MNTA has the only approved generic, holds the best economics for the company (45% profit share). In the event that Sanofi launches an authorized generic, Momenta would receive a royalty on sales up to a certain threshold, and a profit share thereafter, according to the contract. While exact economics have not been disclosed, we estimate Momenta would receive a 10% royalty up to $1bn in sales and a 30% profit share thereafter. In the final scenario, if third-parties launch generic versions of Lovenox, Momenta would only receive a high single-digit royalty on sales (we estimate 8%) of a potentially smaller market, as generic pricing generally deteriorates with multiple competitors.
I also remember NVS is supposed to pay back portion of MNTA's share of development cost after other generic entry. Does this apply to authorized generic?